1 /* 2 * Copyright (c) 2016 Darren Tucker. All rights reserved. 3 * 4 * Permission to use, copy, modify, and distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #include "includes.h" 18 19 #include <sys/types.h> 20 #ifdef HAVE_SYS_PROCCTL_H 21 #include <sys/procctl.h> 22 #endif 23 #if defined(HAVE_SYS_PRCTL_H) 24 #include <sys/prctl.h> /* For prctl() and PR_SET_DUMPABLE */ 25 #endif 26 #ifdef HAVE_SYS_PTRACE_H 27 #include <sys/ptrace.h> 28 #endif 29 #ifdef HAVE_PRIV_H 30 #include <priv.h> /* For setpflags() and __PROC_PROTECT */ 31 #endif 32 #include <stdarg.h> 33 #include <stdio.h> 34 #include <string.h> 35 #include <unistd.h> 36 37 #include "log.h" 38 39 void 40 platform_disable_tracing(int strict) 41 { 42 #if defined(HAVE_PROCCTL) && defined(PROC_TRACE_CTL) 43 /* On FreeBSD, we should make this process untraceable */ 44 int disable_trace = PROC_TRACE_CTL_DISABLE; 45 46 /* 47 * On FreeBSD, we should make this process untraceable. 48 * pid=0 means "this process" but some older kernels do not 49 * understand that so retry with our own pid before failing. 50 */ 51 if (procctl(P_PID, 0, PROC_TRACE_CTL, &disable_trace) == 0) 52 return; 53 if (procctl(P_PID, getpid(), PROC_TRACE_CTL, &disable_trace) == 0) 54 return; 55 if (strict) 56 fatal("unable to make the process untraceable: %s", 57 strerror(errno)); 58 #endif 59 #if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) 60 /* Disable ptrace on Linux without sgid bit */ 61 if (prctl(PR_SET_DUMPABLE, 0) != 0 && strict) 62 fatal("unable to make the process undumpable: %s", 63 strerror(errno)); 64 #endif 65 #if defined(HAVE_SETPFLAGS) && defined(__PROC_PROTECT) 66 /* On Solaris, we should make this process untraceable */ 67 if (setpflags(__PROC_PROTECT, 1) != 0 && strict) 68 fatal("unable to make the process untraceable: %s", 69 strerror(errno)); 70 #endif 71 #ifdef PT_DENY_ATTACH 72 /* Mac OS X */ 73 if (ptrace(PT_DENY_ATTACH, 0, 0, 0) == -1 && strict) 74 fatal("unable to set PT_DENY_ATTACH: %s", strerror(errno)); 75 #endif 76 } 77